title: Spectral tuning of lasing emission from optofluidic droplet microlasers using optical stretching.
abstract: We introduce tunable optofluidic microlasers based on active optical resonant cavities formed by optically stretched, dye-doped emulsion droplets confined in a dual-beam optical trap. To achieve tunable dye lasing, optically pumped droplets of oil dispersed in water are stretched by light in the dual-beam trap. Subsequently, resonant path lengths of whispering gallery modes (WGMs) propagating in the droplet are modified, leading to shifts in the microlaser emission wavelengths. Using this technique, we present all-optical, almost reversible spectral tuning of the lasing WGMs and show that the direction of tuning depends on the position of the pump beam focus on the droplet. In addition, we study the effects of temperature changes on the spectral position of lasing WGMs and demonstrate that droplet heating leads to red-tuning of the droplet lasing wavelength.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Aas
authors.forename: Alexandr
authors.initials: A
authors.lastname: Jonáš
authors.forename: Alper
authors.initials: A
authors.lastname: Kiraz
authors.forename: Oto
authors.initials: O
authors.lastname: Brzobohatý
authors.forename: Jan
authors.initials: J
authors.lastname: Ježek
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Pilát
authors.forename: Pavel
authors.initials: P
authors.lastname: Zemánek